Is it necessary to photograph the gray board?

Photographic gray board is only needed for professional shooting.

1. This is to determine the white balance. If the white balance is correct, the color of the film will be true and will not be cast.

2. The main function of the gray board is to determine the exposure. Turn the camera to position A, switch the focus to MF, fill the whole frame with gray board, press the shutter, and record the combination of aperture and shutter. This combination is one of the suitable exposure combinations under the current lighting conditions.